Iirc Heinlein said he was interviewed about his portrayal of atomic bombs in this work from 1941: https://en.m.wikipedia.org/wiki/Sixth_Column https://en.m.wik

Iirc Heinlein said he was interviewed about his portrayal of atomic bombs in this work from 1941: https://en.m.wikipedia.org/wiki/Sixth_Column https://en.m.wikipedia.org/wiki/Sixth_Column